M41T00_08 STMICROELECTRONICS [STMicroelectronics], M41T00_08 Datasheet - Page 10

• Manufacturer Part Number: M41T00_08
• Description: Serial real-time clock
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

2.7
2.8
10/25
Characteristics
Table 2.
1. Valid for ambient operating temperature: T
2. Transmitter must internally provide a hold time to bridge the undefined region (300 ns max) of the falling
READ mode
In this mode, the master reads the M41T00 slave after setting the slave address (see
Figure
word address An is written to the on-chip address pointer. Next the START condition and
slave address are repeated, followed by the READ mode control bit (R/W = 1). At this point,
the master transmitter becomes the master receiver. The data byte which was addressed
will be transmitted and the master receiver will send an acknowledge bit to the slave
transmitter. The address pointer is only incremented on reception of an acknowledge bit.
The M41T00 slave transmitter will now place the data byte at address An+1 on the bus. The
master receiver reads and acknowledges the new byte and the address pointer is
incremented to An+2.
This cycle of reading consecutive addresses will continue until the master receiver sends a
STOP condition to the slave transmitter.
An alternate READ mode may also be implemented, whereby the master reads the M41T00
slave without first writing to the (volatile) address pointer. The first address that is read is the
last one stored in the pointer.
t
HD
t
Symbol
t
t
t
SU
HD
SU
SU
edge of SCL.
t
t
t
f
HIGH
:DAT
LOW
SCL
BUF
t
:STO
t
:STA
:STA
:DAT
R
F
7). Following the WRITE mode control bit (R/W = 0) and the acknowledge bit, the
(2)
SCL clock frequency
Clock low period
Clock high period
SDA and SCL rise time
SDA and SCL fall time
START condition hold time
(after this period the first clock pulse is generated)
START condition setup time
(only relevant for a repeated start condition)
Data hold time
Data setup time
STOP condition setup time
Time the bus must be free before a new
transmission can start
AC characteristics
Parameter
A
= –40 to 85°C; V
(1)
CC
= 2.0 to 5.5 V (except where noted).
Min
250
4.7
4.7
4.7
4.7
0
4
4
0
Typ
Max
100
300
1
Units
kHz
µs
µs
µs
ns
µs
µs
ns
ns
µs
µs